Filter attachment for street-sweepers.



B. KERN.

FILTER ATTACHMENT FOFFSTREET SWEEPERS.

APPLICATION FILED NOV. 19, I914.

1 ,Q88;,O27. v Patented Dec. 17, 1918.

2 SHEETSSHEET l- B. KERN.

FILTER ATTACHMENT FOR STREET SWEEPERS.

APPLICATION FILED NOV. 19, I914.

1388,02? Patented Dec.17,1918.

2 SHEETSSHEET 2.

O I O n 'srn FFECE.

BERNARD KERN, OF SANDUSKY, OHIO.

- FILTER ATTACHMENT FOR STREET-SWEEPERS.

Specification of Letters Batent.

Patented Dec. 17, 1918.

Application filed November 19, 1914. Serial Ive/873,006;

To all whom it may concern:

Be it known that I, BERNARD KERN, a citizen of the United States, residing at Sandusky, in the county'of Erie and State of Ohio, have invented certain new and useful Improvements in Filter Attachments for Street-Sweepers, of .which the following is has been divided,

The present invention relates to an improvement in dust filters which, though adapted for use in many connections, is especially useful in connection with street sweeping machines, particularly where, as in my above mentioned application, air is employed for conveying the refuse collected through a dust separator and to a convenient place of deposit.

Of course where air is employed, as sug: gested, it is necessary to'provide an outlet to the atmosphere for the air after it has performed its function of delivering ordischarging the dust or refuse carried thereby in connection with a dust collector, which latter need not be illustrated or specifically described herein in View of the fact that it is with the air that leaves the dust collector that the present invention deals, and which air obviously, must be in as pure a state as possible at the time 'of its final discharge exteriorly of the machine.

With the foregoing in mind, the invention may be said to consist of a filter through which air initially treated by a main separator is forced to pass, and through the medium of which filter any minute particles of dust escaping said separator will be taken from the air, so that the latter as finally and upon an inspection of which in connectionw-ith the detailed description here inafter contained, the-improvements will be clear, I

Figure 1 is a vertical sectional View through the filter and associated parts of the street sweeping machine,

Fig. 2 is a sectional view at right angles r,

to the section of Fig. 1,

Fig. 3 .is a face.view of one of the filter parts,

Fig. 4 is a transverse section thereof, and 5 is'a detail perspective, partly in section.

Referring more specifically to the drawings wherein like reference characters designate corresponding parts inthe several views, it will be observed that I provide a filter frame V adapted to be-mounted upon the outside of a street sweeping machine and adapted to open as at V to the dust box-of the machine. This filter; frame is of step-like formation to provide the outwardly progressively enlarging seats-o, o. and, o

for the accommodation of filter sections'of similarly increasing diameters. The filter sections are of like construction, differing only as to size and are disposed, as shown, to provide vertically disposed collecting spaces, a therebetween.

7 Each filter section comprises. a surround-- ing wooden .franie W secured against the opposite surfaces of which are foraminated sheets of material, conveniently wire gauze W interposed between the frame and fastening strips w tacked to the Iframe, the wire gauze being spaced to provide a chamher for the reception of a suitablenon-absol-bent material such a moss 'w capable .of arresting the minute particles of dust carried by the outgoing air, the latter being compelled to pass through the various'filter sections prior to its final discharge. The moss is prevented from undue displacement within the filter racks by means of wire loops or equivalent ties. to passing through the moss at a number of points and secured to the foraminated seats, readily accomplished by merely threading the wire through said seats to constitute loops.

Y are gravity dogs or latches, pivoted at 2 to the side members of the filter frames W and adapted to be swung into engagement with notched ortions y of the end walls of the supporting frame V.

Beyond the walls of the filter sections,

an air space Z is provided in the frame V, this frame being closed. at its bottom ends and normally at its front,which said air space opens to discharge upwardly, as at z, to prevent the air blast being projected laterally of the machine in the caseof a street sweeper, which naturally Would be objectionable in many respects to persons passing the machine and relative to merchandise displayed on idewalks, etc.

Access to the space Z, Well as to th moss racks is obtained through a front door 2 normally closed as stated, as illustratee in full lines, but adapted to be swung ope upon a hinged connection z. opening this door it is apparent t iat the racks may properly adjusted in place, the latches manipulated to fasten or unfasten the racks and the racks Withdrawn and replaced or others substituted for the same. The smaller raclr or racks may at times be Withdravvn through the door opening, but the size of the al outlet opening 2 is such that any or oi the raclrs though of larger size, may intr duced or \Vltildltl'Wll in erethrounli,

Vertical direction Sheeps Wool A ie dust-sea ng the a-v proved nialarly useful in rious other portions of my chines or heavy is interposed between the filter l? and their se a), '2) and o respectively, as indicated at 20*.

l have referred to the desirability of with: drawing the moss racks for purpose cleansing the same and in order to permit of their being ex editiously vashel and shaken I will now refer to to ues of the construction ivhich tend materially to that end. I have found that the roost etlicient Way of cle 11g the racks is by subjecting the same to the action of a Wate hose an to permit the use of ivnte th Lt purpose 1 employ in the construction or the moss racks What is known as southern moss, which is substant 'ly, non-absorbent, and. though dense and bea ing heat a line fiber, rendering it ieeially u ter for dust, will permit Water therethroughand carry out he collectee dust Without said Water being nia'telially taken up by the mess.

While a simple frame, such as that heretofore described, may be ciiicient in many instances, yet to enable the frame to be shaken by rocking or jarring the same on its edges or corners, 1 preferably reinforce the frame by crossed tie bars 2 and 3 of angle metal riveted together at their crossing point at the center of the rack, as indicated at l, and secured in any practical Way the trains W, as byprojecting the ends of the bars into suitable seats 5 provided therefor, "these tie bars being arranged centrally of moss ther strengthened by entirely surrounding the 881116 with a metallic band 65, secured to the frame il and overlapping at its edges, the outer iiarginal portions 01 the toraminated sheets w and their fastening strips w. While l have herein disclosed the preferred embodimentof the invention, it will be understood by persons'skilled in the art that said invention is capable of embodiment in t er forms and devices Without deoarting from the spirit thereof and as made iaccordance With the hereto appended claims, v

Having thus described the invention, What is claimed is;

l i i filter rack of the character described comprising a "frame, toraminated sheets spaced apart and resting against opposite suri a es of the frame, strips overlying the foraminated sheets and secured to the "ravine to fasten the sheets therebetween, and a liter filling in the space between the sheets, the rame being provided With means projectina' therefrom a slight distance in opposite directions to protect the marginal edges of the sheets and fastening strips, said means consisting aseparate reinforcing band 'facing said marginal edges of the sheets and the frame to reinforce the same.

2. in dust collecting machine, a frame having sui ble bearing surfaces in series and an ope g in the upper portion thereof, afilter co ising a plurality of removable filter closely associated to provide ollecting spaces therebetween, in combinaineans for securing the racks faceie said bearing surfaces, said Wes and racks being arranged in st p so relation, all oi said racks being tarough the top opening and the tion of the same also being formed -ernoval of the racks through opening, Without removing portions of he frame, substantially as described.

3. A filter rack of the character described, conior'sing 1 a relatively Wide said a iraine havi H et opening in its upper end, a filter thin the frame the saio rack being adapts i normally to be placed "Within the "frame beyond said opening and to be removed therefrom through said openin ln dust collecting machine, a "frame having surfaces, and an open up prising a having a suitable bea surface and an opening i the upper nortion thereoi at one F PA,

end, a i reniovaoiy rated a aanst saidbearing surface and spaced from the front portion of the frame to facilitate the removal of the rack and direct the filtered air outwardly through the opening in the upper portion of the frame.

6. In a dust collecting machine, a frame having a suitable bearing surface and a relatively wide opening in its upper portion at one end, a filter comprising a plurality of removable filter racks secured against said bearing surfaces in spaced relation, the front portion of the frame being spaced from the foremost filter rack and movable to facilitate the removal of the racks, the front portion also being adapted to direct the air passing through the filters outwardly through the opening in the-upper portion of the frame.

7. In a dust collecting apparatus the combination of a suitable frame havingspaced bearing surfaces to provide filter receiving spaces of different proportions, filters arranged in said spaces against said bearing surfaces and spaced from one another to providecollectin chambers, said frame being provided with 'a substantially unobstructed air opening in one edge arranged.

forwardly of the foremost filter and connecting with a space in front of said foremost filter whereby to facilitate the removal of the filters, and the front wall of the frame being also constructed to facilitate the said removal of the filters.

8. In a dust collecting machine the, combination of a frame having an open back for communication With a dust box or the like and a front wall with a movable section, said frame having spaced stepped bear ing surfaces to provide receiving spaces for filters of different diameters with the filters of increasing diameters toward the front wall, filters positioned within the frame against said bearing surfaces, and said frame having a substantially unobstructing space between the foremost filter and front wall, which said space communicates with a substantially unobstructed opening in an posed at will, a supporting bearing surface on the frame, a removable filter member positioned within the frame against said bearing surface, said filter member having a body portion of dense non-absorbent material with embedded anchoring means, said filter being spaced from the front wall of the frame by a non-obstructed space and the top wall above the space having opening communicating with said space and of a size to permit continuous outlet for air at this point or the removal of the filter therethrough at will.

10. A filter rack of the character de-- scribed comprising an open border or frame, foraminated sheets secured to opposite sides of the frame forming an intermediate space, a filling of dense non-absorbent dust collecting moss disposed be tween said sheets to arrest the dust carried by the air vpassing through the filter, an angle bar projecting through thespace between the top and bottom of the frame and embedded at its ends in the latter, a transversely extending angle bar extending through the space between the plates secured to the first mentioned angle bar and embedded at its ends in the sides of the frame, said filling completely surrounding said angle bars, and a plurality of independent intermediate anchoring means projecting through the filling material and secured to said plates.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

A. J. HENDRICKSON, EMMETT MARTIN. 

